Method of manufacturing staple-driving punches



G. WINTER Nov. 8, 1932.-

METHOD OF MANUFACTURING STAPIJELDR-IVING .PUNCHES Filed May 4. 1931 Patented Nov. 8; 1932 UNITED STATES GEBHABD WINTER, OF VIENNA, AUSTRIA.

rm'rnon or manurac'runme STAPLE-DRIVING, rUNcnEs Application filed May 4, 1931, Serial No. 534,978, and in Austria Kay 10, 1930.

This invention relates to the known devices for driving wire staples, in particular as used in connection with electric installation work,

and has for its object to simplify and to cheapen the manufacture of such devices by providing for the making of the punch and .for the fitting and assembling of the same in its guiding sleeve or holder according to a method which has proved in practise to be the most advantageous for this purpose. In

known tools of this character, it is apparentthat they are rather complicated or they utilize a limiting pin or key to prevent the punch from falling out of its guide member, which pin or key becomes easily damaged upon use of the punch.

According to the method provided by the present invention a round-section bar destined to form the punch is first cut to length, after which for a certain distance from one end the material of the bar is removed on two sides to leave a'thin central flat portion of the width of the diameter of the bar, the end of which flat portion is then provided with a central notch. The

punch is then inserted inthe guiding sleeve -or holder which is suitably'flattened at one end. The forked end of the flat portionof the punch formed by the above-mentioned I notch is then spread laterally, sothat the punch can no longer be withdrawn from the sleeve.

The flat end portion of the punch can also be made by welding or soldering a suitably 5 shaped strip to the one end of 'a-cylindrical bar. a

The separate stages of the method according to the invention are illustrated, by way of example, in the accompanying drawing in which: I

Figure 1 is a side View and an end view of a metal blank of which the punch is made, Fig. 2 shows two side views, one turned 90 in respect to the other, and an end view showing the first step of the method,

Fig. 3 is a side view showing the next step, Fig. 4 is a side View and an end view showing a further step in the method showing the punch in its sleeve,

Fig. 5 is a side view showing the final step of the method,

Fig 6 is a side view of the punch in two parts, and v Fig. 7 is a side view partly in section showing the two parts of F ig.'6 secured together. Referring to the drawing, the punch proper is formed of a round-section bar or blank (I (Fig. 1) of the length of the finished punch. This bar a is cut away for a certain distance 9 from one end, on two sides, so that a central flat portion 6 remains (Fig. 2). The end of i this flat portion is then notched at c (Fig. 3).

The punch, is now in a state to be inserted from the upper. endinto its guide sleeve or holder 11 (Fig. 4) which is cylindrical in shape with its lower end flattened to receive the flat end portion of the punch. For the purpose of locking the punch against re moval from or rotation within the holder the forked end of the punch formed'by the notch c is now spread out (Fig. 5), so that the ends e are bent slightly outwards, making the over-all width at the end of the punch greater than that'ofthe flat portion 6 or than the diameter of the bar a. In consequence, the punch can only be lifted within the holder until this flared end comes into contact with the shoulder formed at the transition from the cylindrical portion of the holder to the 30 flattened portion of the same. The assembling of the punch in its holder is thus com: pleted, and the device is ready for. use.

The flat portion 6 of the punch can also made by the welding or soldering ofa strip 35 of metal of the same breadth as the round portion of the punch to one end of the latter,

theremaining stages of the manufacturing process being the same as before.

- Itis likewise possible to spread the end of the unch before the insertion thereof in the hol er, the latter being subsequently flattened about the flat portion of the punch. The punch may be made in two pieces or sec-' tions as shown in Fig. 6 in which the flat por- 1 tion may be made separately and then welded, I soldere'd or secured in any other suitable manner to the bar a as shown in Fig. .7.

I claim 1. The method of manufacturing a device'for driving wire staples which consists in forming a punch having a cylindrical up l per portion and a flat lower portion, cutting a notch in the outer end of the said flat portion, inserting said punch in a hollow sleeve having a cylindrical upper portion and a flat lower portion, the width of the flat lower portion being greater than the diameter of said cylindrical upper portion, and widenin said notch laterally to flare the extreme en of the flat lower portion of the punch, for the purpose of assemblin said punch wlthm the hollow sleeve, and o preventing the removal of the punch from the sleeve.

2. A. method as claimed in claim 1, in which the said punch is formed by the welding of a metal strip to the end of a roundsection bar of a diameter equal to the breadth of the said strip.

3. A method as claimed in claim 1, in which the said punch is formed by soldering a strip of metal to the end of a round-section bar of a diameter equal to the breadth of the said strip.

4. The method of manufacturing a device for drivin staples which comprises forming a punc having a cylindrical upper portion and a flat lower portion, cutting a notch in the outer end of the flat portion, widenin said notch laterally to flare the extreme en of said flat lower portion of the punch, inserting the punch in a cylindrical hollow sleeve, and flattening the lower portion of the hollow sleeve'adjacent the flat lower portion of the punch thereby preventing the removal of the punch from the sleeve.

5. The method of manufacturing a device for driving staples which comprises flattening one end of a cylindrical metal blank, cutting a notch in the outer end of the flat portion of the blank, flattening one end of a cylindrical hollow sleeve, inserting the blank in the sleeve, and widening out the notch laterally to flare the extreme end of the flat portion whereby the flared notch and fiat portion of the hollow sleeve prevent the removal of the blank from the sleeve.

6, The method of manufacturing a device for driving staples which com rises providmg a flat portion on one end 0 a cylindrical metal blank, cutting a notch in the outer end of the fiat portion of the blank, flattening one end of a cylindrical hollow sleeve, insertmg the blank in the sleeve, and widening out the notch laterally to flare the extreme end of the flat portion whereby the flared notch and flat portion of the hollow sleeve prevent the removal of the blank from the sleeve.

7. The method of manufacturing a device for driving staples which com rises providmg a flat portion on one end 0 a cylindrical metal blank, cutting a notch in the outer end of the flat portion, inserting the blank and flat portlon in a cylindrical hollow sleeve,

flat portion of the blank, and widening out the notch laterally to flare the extreme end of the flat portion whereby the flared notch and flat ortion of the sleeve prevent the removal'o the blank and its flat portion from the sleeve.

- In testimony whereof I afiix my signature.

. GERHARD WINTER.

flattening one end of the sleeve adjacent the 

